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Goodwill and Other Intangible Assets, Goodwill by Reporting Unit (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill | $ 1,083.6 | $ 1,075.2
United States [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 505.9 | 505.9
Netherlands [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 97.3 | 85.9
United Kingdom [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 86.6 | 85.9
France [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 70.8 | 76.9
Right Management [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 62.1 | 62.1
Other reporting units [Member] |  |
Goodwill [Line Items] |  |
Goodwill | $ 260.9 | $ 258.5

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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